Fabian Schulz

Spin and Charge Control of Topological End States In Chiral Graphene Nanoribbons on a 2D Ferromagnet

Fabian Schulz

Chiral graphene nanoribbons (chGNRs) can exhibit symmetry-protected electronic states at their zigzag termini. At half filling, each of these end states hosts a highly localized spin-1/2 magnetic moment. Owing to their topological protection, these spins are promising candidates for future applications in …

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Topological Engineering of a Frustrated Antiferromagnetic Triradical in Aza-Triangulene Architectures

Francisco Romero‐Lara, Manuel Vilas‐Varela, Manish Kumar, Ricardo Ortiz et autres

Open-shell nanographenes provide a versatile platform to host unconventional magnetic states within their π-conjugated networks. Particularly appealing are graphene architectures that incorporate spatially separated radicals and tunable interactions, offering a scalable route toward spin-based quantum architectures. Triangulenes are ideal for this purpose, …

Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet

Leonard Edens, Francisco Romero‐Lara, Kalyan Biswas, Manuel Vilas‐Varela et autres

Abstract Tailor‐made graphene nanostructures can exhibit symmetry‐protected topological boundary states that host localized spin‐1/2 magnetic moments at half filling. However, one frequently observes charge transfer on coinage metal substrates, which results in closed‐shell configurations. Using low‐temperature scanning tunneling spectroscopy, it is demonstrated …

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On-Surface Synthesis of Nanographenes with Polyradical States

Fabian Schulz, Francisco Romero‐Lara, Alessio Vegliante, Héctor Briongos-Merino et autres

π-magnetism in carbon-based nanostructures offers a potential route towards molecular spintronics [PRL 102, 157 (2009)]. However, its realization relies on the precise control over the charge and spin state of the molecular building blocks. One promising candidate to achieve such level of …

Scattering near-field optical microscopy at 1-nm resolution using ultralow tip oscillation amplitudes

Akitoshi Shiotari, Jun Nishida, Adnan Hammud, Fabian Schulz et autres

Scattering-type scanning near-field optical microscopy (s-SNOM) allows for the observation of the optical response of material surfaces with a resolution far below the diffraction limit. Based on amplitude-modulation atomic force microscopy (AFM) with typical tapping amplitudes of tens of nanometers, a spatial …

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On-Surface Synthesis of a Ferromagnetic Molecular Spin Trimer

Alessio Vegliante, Manuel Vilas‐Varela, Ricardo Ortiz, Francisco Romero‐Lara et autres

High Resolution Image Download MS PowerPoint Slide Triangulenes are prototypical examples of open-shell nanographenes. Their magnetic properties, arising from the presence of unpaired π electrons, can be extensively tuned by modifying their size and shape or by introducing heteroatoms. Different triangulene derivatives …

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Ultrafast dynamics of local charge order in a THz-induced metastable quantum state

Luis Enrique Parra López, Alkisti Vaitsi, Vivien Sleziona, Fabian Schulz et autres

Controlling quantum materials with ultrafast light pulses enables access to transient and metastable states that are inaccessible under equilibrium conditions. Yet their local dynamics remain poorly understood due to the challenge of resolving ultrafast processes with angstrom-scale spatial resolution. Here, we use …

Plasmonic Light Emission by Inelastic Charge Transport in Ultrathin Zinc Oxide/Metal Heterostructures

Henrik Wiedenhaupt, Fabian Schulz, Luis Enrique Parra López, Adnan Hammud et autres

High Resolution Image Download MS PowerPoint Slide Controlling light emission from plasmonic nanojunctions is crucial for developing tunable nanoscale light sources and integrated photonic applications. It requires precise engineering of plasmonic nanocavity electrodes and a detailed understanding of electrically driven light emission. …

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Nuclear density dependence of polarization transfer in quasi-elastic A ( e , e ′ p ) reactions

T. Kolar, Wim Cosyn, C. Giusti, P. Achenbach et autres

The ratio of the transverse and longitudinal components of polarization transfer to protons in the quasielastic $(\stackrel{P\vec}{e},{e}^{\ensuremath{'}}\stackrel{P\vec}{p}\phantom{\rule{0.16em}{0ex}})$ reaction, ${P}_{x}^{\ensuremath{'}}/{P}_{z}^{\ensuremath{'}}$, is sensitive to the proton's electromagnetic form factor ratio, ${G}_{E}/{G}_{M}$. To explore density-dependent in-medium modifications, a comparison of polarization transfer ratios involving protons …

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Scattering near-field optical microscopy at 1-nm resolution using ultralow tip oscillation amplitudes

Akitoshi Shiotari, Jun Nishida, Adnan Hammud, Fabian Schulz et autres

Scattering-type scanning near-field optical microscopy (s-SNOM) allows for the observation of the optical response of material surfaces with a resolution far below the diffraction limit. Based on amplitude-modulation atomic force microscopy (AFM) with typical tapping amplitudes of tens of nanometers, a spatial …

Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates

Alkisti Vaitsi, Vivien Sleziona, Luis Enrique Parra López, Yannic Behovits et autres

Spintronic terahertz emitters (STEs) are powerful sources of ultra-broadband single-cycle terahertz (THz) field transients. They work with any pump wavelength, and their polarity and polarization direction are easily adjustable. However, at high pump powers and high repetition rates, STE operation is hampered …

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Nuclear density dependence of polarization transfer in quasi-elastic ${\rm A}(\vec{e},e' \vec{p})$ reactions

T. Kolar, Wim Cosyn, C. Giusti, P. Achenbach et autres

The ratio of the transverse and longitudinal component of polarization transfer to protons in the quasi-elastic $(\vec{e}, e^{\prime} \vec{p}\,)$ reaction, $P^{\prime}_x/P^{\prime}_z$, is sensitive to the proton's electromagnetic form factor ratio, $G_E/G_M$. To explore density-dependent in-medium modifications, a comparison of polarization transfer ratios …

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